#include <REGX52.H>

void Delayms(unsigned int xms)		//@12.000MHz
{
	unsigned char i, j;
	
	while (xms){
		i = 2;
		j = 239;
		do
		{
			while (--j);
		} while (--i);
		xms--;
	}
	
}


void main(){
	unsigned char LEDNum = 0;
	while(1){
		if (P3_1==0)
		{
			Delayms(20);
			while(P3_1==0);
			Delayms(20);
			LEDNum++;
			P2=~LEDNum;
			// P2=LEDNum;
		}
	}
}
			
			